US7119745B2 - Apparatus and method for constructing and packaging printed antenna devices - Google Patents
Apparatus and method for constructing and packaging printed antenna devices Download PDFInfo
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- US7119745B2 US7119745B2 US10/881,104 US88110404A US7119745B2 US 7119745 B2 US7119745 B2 US 7119745B2 US 88110404 A US88110404 A US 88110404A US 7119745 B2 US7119745 B2 US 7119745B2
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q9/00—Electrically-short antennas having dimensions not more than twice the operating wavelength and consisting of conductive active radiating elements
- H01Q9/04—Resonant antennas
- H01Q9/16—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole
- H01Q9/26—Resonant antennas with feed intermediate between the extremities of the antenna, e.g. centre-fed dipole with folded element or elements, the folded parts being spaced apart a small fraction of operating wavelength
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/08—Measuring electromagnetic field characteristics
- G01R29/10—Radiation diagrams of antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2223/00—Details relating to semiconductor or other solid state devices covered by the group H01L23/00
- H01L2223/58—Structural electrical arrangements for semiconductor devices not otherwise provided for
- H01L2223/64—Impedance arrangements
- H01L2223/66—High-frequency adaptations
- H01L2223/6661—High-frequency adaptations for passive devices
- H01L2223/6677—High-frequency adaptations for passive devices for antenna, e.g. antenna included within housing of semiconductor device
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/04042—Bonding areas specifically adapted for wire connectors, e.g. wirebond pads
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/10—Bump connectors; Manufacturing methods related thereto
- H01L2224/15—Structure, shape, material or disposition of the bump connectors after the connecting process
- H01L2224/16—Structure, shape, material or disposition of the bump connectors after the connecting process of an individual bump connector
- H01L2224/161—Disposition
- H01L2224/16151—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/16221—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/16225—Disposition the bump connector connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/481—Disposition
- H01L2224/48151—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive
- H01L2224/48221—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked
- H01L2224/48225—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation
- H01L2224/48227—Connecting between a semiconductor or solid-state body and an item not being a semiconductor or solid-state body, e.g. chip-to-substrate, chip-to-passive the body and the item being stacked the item being non-metallic, e.g. insulating substrate with or without metallisation connecting the wire to a bond pad of the item
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
- H01L2224/73201—Location after the connecting process on the same surface
- H01L2224/73207—Bump and wire connectors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/30—Technical effects
- H01L2924/301—Electrical effects
- H01L2924/3011—Impedance
Definitions
- the present invention relates generally to antennas for wireless or RF (radio frequency) communications systems and, more specifically, printed antenna designs that provide both high bandwidth and efficiency with substantially hemispherical radiation patterns, as well as apparatus and methods for packaging such antennas with IC (integrated circuit) chips.
- RF radio frequency
- a wireless network such as a wireless PAN (personal area network), a wireless LAN (local area network) a wireless WAN (wide area network), a cellular network, or virtually any radio network or system
- a wireless PAN personal area network
- a wireless LAN local area network
- a wireless WAN wide area network
- a cellular network or virtually any radio network or system
- FIG. 1 depicts a conventional planar circuit board antenna ( 10 ) comprising a planar dielectric substrate ( 11 ) (or circuit board) having a printed antenna ( 12 ) over a ground plane ( 13 ) at a distance h, wherein the printed antenna ( 12 ) and ground plane ( 13 ) are formed on opposite sides of the dielectric substrate ( 11 ).
- An antenna framework as depicted in FIG. 1 with a printed antenna on a dielectric substrate/circuit board with a reflecting ground plane below is typically used for applications in which it is desirable to limit the antenna radiation to the upper hemisphere above the antenna ( 10 ).
- the antenna “efficiency” is a measure of the relation between the power radiated by an antenna and the power input to the antenna (a lossless antenna provides 100% efficiency). Antenna efficiency will decrease due to resistive losses and impedance mismatches.
- PTFE-based substrates which provide the lowest available dielectric constant for a substrate material of 2.1, are typically used for printed antenna designs such as in FIG. 1 , because they provide good bandwidth-efficiency product designs, e.g., 10% bandwidth at 80% efficiency.
- exemplary embodiments of the invention generally include printed antenna devices that can operate at RF and microwave frequencies, for example, while simultaneously providing good antenna performance characteristics such as high gain/directivity/radiation efficiency, high bandwidth, hemispherical radiation patterns, impedance, etc., which render such antennas suitable for voice communication, data communication or radar applications, for example.
- an antenna device comprises a planar substrate, an antenna pattern formed on a first surface of the planar substrate, and a ground plane that is disposed substantially parallel to, and displaced from, the first surface of the planar substrate and facing the antenna pattern.
- the antenna pattern may comprises one of various types of antennas that can be printed on a planar substrate including, but not limited to, patch antennas (e.g., coplanar patch), dipole antennas, folded dipole antennas, monopole antennas, ring antennas, loop antennas, etc.
- a space between the ground plane and planar substrate can be filled with air or a low dielectric material such as foam.
- the antenna device may include an antenna feed network formed on the first surface of the planar substrate.
- the antenna feed network may include an impedance matching network.
- the antenna includes a beamshaping pattern formed on first surface of the planar substrate, a second surface opposite the first surface of the planar substrate, or both the first surface and second surface of the planar substrate, to reduce radiation in a direction along the plane of the planar substrate and/or to enhance a hemispherical radiation pattern of the antenna (i.e., enhance directivity of the antenna).
- Exemplary embodiments of the invention further include apparatus and methods for integrally packaging printed antenna devices according to the invention with IC (integrated circuit) chips (e.g., transceiver) to construct IC packages for, e.g., wireless communications applications.
- IC integrated circuit
- printed antenna devices according to embodiments of the invention can efficiently operate with relatively small ground planes, which enables compact packaging of such antennas with IC chips (e.g., a transceiver IC chip, a receiver or transmitter chip, and/or other IC chips) in a relatively small package similar in size to that of existing leaded carriers or leadless chip carriers for, e.g., transceiver ICs.
- an IC (integrated circuit) package device comprises: a package substrate having a ground plane formed on a surface thereof; an IC chip bonded to the surface of the package substrate; a planar substrate comprising an antenna pattern formed on a first surface of the planar substrate, wherein the planar substrate is flip-chip bonded to the IC chip such that the antenna pattern faces toward the ground plane of the package substrate and the first surface of the planar substrate is disposed substantially parallel to, and displaced from, the ground plane of the package substrate; and a package cover formed over the package base substrate to encapsulate the IC chip and planar substrate, wherein the package cover comprises an opening that exposes a portion of a second surface of the planar substrate opposite a portion of the first surface of the planar substrate having the antenna pattern.
- FIG. 1 is a schematic diagram illustrating an conventional printed antenna design.
- FIG. 2 is a schematic diagram illustrating a printed antenna device according to an exemplary embodiment of the invention.
- FIG. 3A is a schematic diagram illustrating an exemplary prototype antenna device comprising a printed folded dipole antenna and feed network according to an exemplary embodiment of the invention.
- FIG. 3B schematically illustrate a metal bridge structure that was built to provide a ground plane and air cavity for the exemplary prototype antenna device of FIG. 3B .
- FIG. 4 graphically illustrates vertical radiation patterns that were measured and obtained for 60 GHz antenna devices that were built and simulated based on the framework of FIG. 3A .
- FIGS. 5A and 5B are graphical diagram illustrating impedance match parameters (S 11 ) that were measured and obtained for 60 GHz antenna devices that were built and simulated based on the framework of FIG. 3A .
- FIGS. 6A and 6B are schematic diagrams illustrating an apparatus for integrally packaging an antenna and IC (integrated circuit) chip, according to an exemplary embodiment of the present invention.
- FIGS. 7A ⁇ 7F are schematic illustrations of various planar antennas that can be implemented for an antenna framework as depicted in FIG. 2 according to exemplary embodiments of the invention.
- Exemplary embodiments of the invention generally include printed antenna devices that can operate at RF and microwave frequencies, for example, while simultaneously providing antenna performance characteristics such as high gain/directivity/radiation efficiency, high bandwidth, hemispherical radiation patterns, impedance, etc., that render the antennas suitable for voice communication, data communication or RADAR applications, for example.
- Exemplary embodiments of the invention further include apparatus and methods for integrally packaging printed antenna devices according to the invention with IC (integrated circuit) chips (e.g., transceiver) to construct IC packages for, e.g., wireless communications applications.
- IC integrated circuit
- printed antenna devices according to embodiments of the invention can efficiently operate with relatively small ground planes, which enables compact packaging of such antennas with IC chips (e.g., transceiver IC chip) in a relatively small package similar in size to that of existing leaded carriers or leadless chip carriers for, e.g., transceiver ICs.
- IC chips e.g., transceiver IC chip
- antennas according to the invention which are designed to operate at resonant frequencies of about 20 GHz or greater are sufficiently small to be packages with such existing IC chips.
- FIG. 2 a schematic diagram illustrates an antenna device according to an exemplary embodiment of the present invention.
- FIG. 2 is a cross-sectional schematic view of a printed antenna device ( 20 ) according to an exemplary embodiment comprising a planar substrate ( 21 ) of thickness (t), a printed antenna circuit ( 22 ) (and feed network) formed on a surface of the substrate ( 21 ) and a planar metallic ground plane ( 23 ).
- the planar metallic ground plane ( 23 ) is disposed substantially parallel to planar substrate ( 21 ) facing the antenna pattern ( 22 ).
- the ground plane ( 23 ) is positioned at a distance (h) from the surface of the printed antenna ( 22 ), thereby forming a space ( 24 ) (or cavity) between the ground plane ( 23 ) and surface of the substrate ( 21 ) on which the printed antenna ( 22 ) is formed.
- the printed antenna ( 22 ) may comprise one or more of various types of printed planar antennas including, for example, a dipole antenna ( FIG. 7A ), a folded dipole antenna ( FIG. 7B ), a ring antenna ( FIG. 7C ), a rectangular loop antenna ( FIG. 7D ), a patch antenna ( FIG. 7E ), a coplanar patch antenna ( FIG. 7F ), monopole antennas, etc., as well one or more of various types of antenna feed and/or impedance matching networks, such as balanced differential lines, coplanar lines, etc.
- the substrate ( 21 ) may comprise any suitable material including, for example, dielectric or insulative materials such as fused silica (SiO 2 ), alumina, polystyrene, ceramic, teflon based substrates, FR4, etc., or semiconductor materials such as high resistivity silicon or GaAs, etc., depending on the antenna implementation.
- the printed antenna ( 22 ) (and optional feed networks) may be formed by depositing and patterning a thin film conductive material such as copper or gold, for example, using methods known to those of ordinary skill in the art.
- an exemplary antenna device ( 20 ) maintains the benefits of conventional printed circuits depicted in FIG.
- the exemplary antenna framework of FIG. 2 provides both high bandwidth and high efficiency at the same time, which is the result of various factors such as the antenna ( 20 ) having a very low dielectric “substrate” (e.g., air cavity ( 24 )) between the printed antenna ( 22 ) and ground ( 23 ), and the antenna ( 20 ) having a high dielectric ( 21 ) material above the printed antenna ( 22 ).
- a very low dielectric “substrate” e.g., air cavity ( 24 )
- exemplary embodiments of the invention will be described with particular reference to printed folded dipole antenna devices and integration of such devices in semiconductor IC packages. It is to be understood, however, that the present invention is not limited to any particular antenna type or operating frequency. Instead, the invention is more generally applicable to any antenna type that is suitable for a given application and/or frequency of operation to provide a high bandwidth and efficiency product antenna.
- FIG. 3A is a schematic diagram illustrating an exemplary antenna device comprising a printed folded dipole antenna and feed network according to an exemplary embodiment of the invention.
- FIG. 3A schematically depicts a printed antenna device ( 30 ) comprising a planar dielectric substrate ( 31 ), a printed folded dipole antenna ( 32 ), and a feed network comprising a balanced differential line ( 33 ) connected to a finite ground coplanar line ( 34 ) via a balun ( 35 ).
- the printed folded dipole antenna ( 32 ) and a feed network ( 33 , 34 and 35 ) are formed on one surface (S 1 ) of substrate ( 31 ).
- the antenna ( 30 ) further optionally comprises a pair of metal bars ( 36 ) (shown in phantom) formed on a substrate surface (S 2 ) which is opposite the surface (S 1 ) on which the antenna ( 32 ) and feed network ( 33 , 34 , 35 ) are formed.
- the metal bars ( 36 ) are used for limiting the effect of surface/substrate waves that propagate in the direction along the plane of the antenna substrate ( 31 ) and provide more gain in the desired direction.
- the metal bars ( 36 ) can be generally considered as a “beamshaping” or “beamshaping enhancement” pattern that suppress radiation or wave propagation in the direction parallel to the substrate ( 31 ) and increase radiation or wave propagation in the desired direction (e.g., perpendicular to the substrate ( 31 )).
- the metal (beamshaping) bars ( 36 ) are placed parallel to the folded dipole ( 32 ) on the opposite side (S 2 ) of the substrate ( 31 ) at a distance of approximately 1 ⁇ 2 wavelength (free space) away from the folded dipole antenna ( 32 ). It is to be understood, however, that the metal bars ( 36 ) can be placed on the either side (S 1 or S 2 ) of the substrate ( 31 ), or on both sides (S 1 and S 2 ) of the substrate ( 30 ), to effectively suppress surface/substrate wave propagation and enhance directivity of the antenna.
- the exemplary metal bars ( 36 ) in FIG. 3A are suitable for use with the exemplary folded dipole antenna design (or a dipole design). It is to be appreciated that the type of beamshaping pattern (or other mechanism) that can be used to suppress surface/substrate wave propagation will vary depending on the type of printed antenna design.
- the differential feed line ( 33 ) comprises two parallel feed lines ( 33 a , 33 b ) of length, L F , that are separated by a gap, G F , and formed in the same plane (i.e., on the same surface of the substrate ( 31 )).
- the gap G F between the feed lines ( 33 a ) and ( 33 b ) results in the formation of a balanced, edge-coupled stripline transmission line.
- the coplanar line ( 34 ) comprises a signal feed line ( 34 a ) formed between two ground lines ( 34 b ).
- the signal feed line ( 34 a ) of the coplanar line ( 34 ) is connected via the balun ( 35 ) to the feed line ( 33 a ) of the balanced differential line ( 33 ).
- the two ground lines ( 34 b ) of the coplanar line ( 34 ) are connected via the balun ( 35 ) to the other feed line ( 33 b ) of the balanced differential line ( 33 ).
- the differential line ( 33 ) is designed to have an intrinsic impedance that can match the impedance of the folded dipole antenna ( 32 ) to the impedance of the coplanar line ( 34 ).
- the impedance of the differential line ( 33 ) can be adjusted by, e.g., varying the width of the feed lines ( 33 a , 33 b ) and the size of the gap G F between the feed lines ( 33 a , 33 b ) as is understood by those of ordinary skill in the art.
- the folded dipole antenna ( 32 ) comprises a first (fed) half-wavelength dipole element comprising first and second quarter-wave elements ( 32 a ) and ( 32 b ) and a second half-wavelength dipole element ( 32 c ), which are disposed parallel to each other and separated by a gap, G D .
- the gap G F of the differential line ( 33 ) separates the first half-wavelength dipole element into the first and second quarter-wavelength elements ( 32 a ) and ( 32 b ).
- the end portions of elements ( 32 a ) and ( 32 b ) are connected (shorted) to end portions of the second dipole element ( 32 c ) by elements ( 32 d ).
- the folded dipole antenna ( 32 ) has a length, denoted as L D , and a width denoted as W D .
- the parameter L D of the folded dipole antenna ( 32 ) will vary depending on the frequency of operation and the dielectric constant of the substrate ( 31 ), for example.
- the feed network framework will vary depending on, e.g., the impedance that is desired for the given application and/or the type of devices to which the antenna will be connected. For example, if the antenna is connected to a transmitter system, the feed network will be designed to provide the proper connections and impedance matching for a power amplifier. By way of further example, if the antenna is connected to a receiver system, the feed network will be designed to provide the proper connections and impedance matching for a LNA (low noise amplifier).
- LNA low noise amplifier
- prototype antennas were constructed using various frameworks similar to that depicted in FIG. 3A for folded dipole antenna device with and without the metal (beamshaping bars)
- the metal bars ( 36 ) were formed with dimensions of 5 mm ⁇ 0.5 mm and placed parallel to the folded dipole ( 32 ) on the opposite side of the fused silica substrate ( 31 ) about 2 mm away from the dipole ( 32 ).
- the differential line ( 33 ) was formed to transform the input impedance of the 60 GHz folded dipole ( 32 ) from about 150 Ohms to 100 Ohms.
- the finite ground coplanar line ( 34 ) was designed and dimensioned (line widths and spacing between lines of 75 microns) to provide a characteristic impedance of 100 Ohms to match the input impedance of the antenna ( 32 ) as provided by the differential line ( 33 ).
- the balun ( 35 ) design was selected to provide a very wide bandwidth over the frequency of operation.
- FIG. 3B schematically illustrates a metal bridge structure ( 40 ) that was used in the exemplary prototype antenna design to provide a ground plane and air cavity.
- the impedance and radiation pattern of the prototype antenna device was measured using a coplanar probe.
- HFSSTM is a 3D EM simulation software tool for RF, wireless, packaging, and optoelectronic design.
- simulations were performed with the following parameters. More specifically, model antennas were defined for a 60 GHz folded dipole antennas (with and without the metal bars) and a feed network having a structure and dimensions similar to those discussed above with reference to FIG.
- FIG. 4 is an exemplary diagram illustrating vertical radiation patterns for a 60 GHz folded dipole antenna device according to the invention. More specifically, FIG. 4 graphically illustrates (using a polar graph) vertical radiation patterns (solid lines) that were measured for the actual antenna prototypes discussed above and the computer simulated vertical radiation patterns (dashed lines) that were obtained using the HFSS simulation tool for the computer modeled antennas discussed above.
- the vertical radiation patterns depicted in FIG. 4 assume a Cartesian coordinate system having an origin located at point “O” (see FIG.
- the Z-axis extends in a direction through the substrate ( 31 ) perpendicular to substrate surfaces, wherein the x-axis longitudinally extends along the substrate surface in a direction along axis of the folded dipole ( 32 ), and wherein the y-axis longitudinally extends along the substrate surface in a direction perpendicular to the axis of the folded dipole antenna ( 32 ).
- 0 degrees represents the positive z direction (which, in FIG. 3A , extends orthoganally away from the surface (S 2 ) of the substrate ( 31 ) above the antenna)
- 180 degrees represents the negative z direction (which, in FIG. 3A , extends orthoganally away from the surface (S 1 ) of the substrate ( 31 ) toward the ground plane).
- FIG. 4 the vertical radiation patterns (in polar coordinates) that were measured/obtained in a
- FIG. 4 illustrates (in polar coordinates) (i) the measured vertical radiation pattern ( 45 ) (solid line) for the antenna prototype with the metal (beamshaping) bars, (ii) the measured vertical radiation pattern ( 47 ) (solid line) for the antenna prototype without the metal (beamshaping) bars, (iii) the vertical radiation pattern ( 46 ) (dashed line) obtained for a computer simulation of the exemplary folded dipole antenna with the metal (beamshaping) bars, and (iv) the vertical radiation pattern ( 48 ) (dashed line) obtained for a computer simulation of the exemplary folded dipole antenna without the metal (beamshaping) bars.
- the vertical radiation patterns depicted in FIG. 4 illustrate good hemispherical radiation patterns with the EM energy radiating mostly in the upper hemisphere ( ⁇ 90 to 90) above the antenna.
- the measured and simulated radiation patterns ( 47 ) and ( 48 ) illustrate that for the 60 GHz folded dipole antenna design without the metal (beamshaping) bars, while there is about 5 dB of gain in vertical direction (0 degrees), there is also significant gain in the horizontal direction (90 degrees) parallel to the substrate ( 31 ).
- the measured and simulated radiation patterns ( 45 ) and ( 46 ) illustrate that for the 60 GHz folded dipole antenna designed with the metal bars, there is an increase of about 5 dB of gain in the vertical direction (0 degrees) and a significant decrease of the gain in the horizontal direction (90 degrees).
- the metal (beamshaping) bars effectively reduce the horizontal radiation and increase the gain in the desired direction.
- the exemplary antenna designs are well suited for use as a feed for a reflector as well as for wireless personal area networks with pattern diversity.
- FIGS. 5A and 5B are diagrams that illustrate measured and simulated impedance match parameters (S 11 ) for the exemplary prototype and simulated 60 GHz folded dipole antenna designs with and without the metal bars as described above.
- FIG. 5A graphically illustrates a measured (solid line) and simulated (dashed line) input impedance match parameters (S 11 ) in dB for the exemplary prototype and simulated antenna designs, respectively, without the metal (beamshaping) bars.
- FIG. 5B graphically illustrates the measured (solid line) and simulated (dashed line) input impedance match parameters (S 11 ) in dB for the respective prototype and simulated 60 GHz folded dipole antenna designs with the metal (beamshaping) bars.
- the measured/simulated input impedance match (S 11 ) graphically shown in FIGS. 5A and 5B illustrates that the various antenna embodiments provide a wide bandwidth of better than 10% (wherein the bandwidth is defined based on the frequency range for which S 11 was measured to be about ⁇ 10 dB or better) over a frequency band of about 57 GHz to about 64 GHz. More specifically, these results indicate that the 60 GHz folded dipole antenna design provides sufficient bandwidth for implementing the exemplary antenna design for ISM band (59–64 GHz) applications.
- FIGS. 6A and 6B are schematic diagrams illustrating an apparatus for integrally packaging an antenna and IC chip, according to an exemplary embodiment of the present invention. More specifically, FIG. 6A schematically illustrates a plan (top) view of an IC package apparatus ( 50 ) and FIG. 6B schematically illustrates a cross-sectional view of the apparatus ( 50 ) along the line 6 B— 6 B.
- the apparatus ( 50 ) comprises a package substrate base ( 51 ) having a metallic ground plane ( 52 ) and a plurality of package contacts/leads ( 53 ) formed thereon.
- An IC chip ( 54 ) (e.g., IC transceiver) is bonded to the package base ( 51 ) on the back (non active) surface of the chip ( 54 ).
- the apparatus further comprises a dielectric substrate ( 55 ) having a first antenna ( 56 ) and feed line ( 57 ) pattern and a second antenna ( 58 ) and feed line ( 59 ) pattern formed on a bottom surface of the substrate ( 55 ).
- a dielectric substrate ( 55 ) having a first antenna ( 56 ) and feed line ( 57 ) pattern and a second antenna ( 58 ) and feed line ( 59 ) pattern formed on a bottom surface of the substrate ( 55 ).
- the antennas ( 56 ) and ( 58 ) and the feed lines ( 57 ) and ( 59 ) are 60 GHz folded dipole antennas and differential feed lines having frameworks as discussed above with reference to FIG. 3A , which are formed on fused silica substrate that is 300 microns thick.
- the first antenna ( 56 ) is used for transmitting signals and the second antenna ( 58 ) is used for receiving signals.
- the substrate ( 55 ) is flip-chip bonded to the active surface of the IC chip ( 54 ) via a plurality of solder balls ( 60 ) and ( 61 ).
- the solder balls ( 60 ) provide electrical connections between active components and/or impedance matching structures of the IC chip ( 54 ) and the feed lines ( 57 ) and ( 59 ) for the respective antennas ( 56 ) and ( 58 ), which provides low loss connection.
- the solder balls ( 61 ) can be used for providing extra mechanical support between the chip ( 54 ) and the substrate ( 55 ).
- the ground plane ( 52 ) of the package base ( 51 ) acts as ground plane for the antennas ( 56 ) and ( 58 ).
- the antenna substrate ( 55 ) is displaced from the ground plane ( 52 ) of the package base ( 51 ) by approximately 500 microns to form a cavity ( 62 ) (which spacing can be readily obtained given the typical dimensions of the IC chip ( 54 ) and the solder balls ( 60 )).
- the cavity ( 62 ) may be an air cavity or the cavity ( 62 ) can be filled with a very low dielectric material (usually foam) if desired, which provides additional mechanical support.
- the apparatus ( 50 ) further comprises a package cover ( 63 ) to encapsulate the IC package, which can be formed of a low-cost plastic material.
- a package cover ( 63 ) to encapsulate the IC package, which can be formed of a low-cost plastic material.
- FIG. 6A the package cover ( 63 ) and dielectric substrate ( 55 ) are depicted in phantom (transparent).
- the package cover ( 63 ) is formed with openings ( 64 ) to expose portions of the antenna substrate ( 55 ) over the antennas ( 56 ) and ( 58 ). These openings ( 64 ) are provided to prevent losses for the antenna radiation.
- metal bars ( 65 ) are formed on the upper surface of the antenna substrate ( 55 ) to optimize the radiation pattern as discussed above.
- the cover openings ( 64 ) are dimensioned to at least expose the metal bars ( 65 ) and the regions of the antenna substrate ( 55 ) between the bars ( 65 ).
- the IC chip ( 54 ) comprises a plurality of contact pads ( 66 ) on the active surface of the chip ( 54 ) for making electrical connections (e.g., ground, power, I/O) between the IC chip ( 54 ) and the package contacts/leads ( 53 ) via bond wires ( 67 ).
- the antenna substrate ( 55 ) is formed into an L-shape to provide an area on the IC chip ( 54 ) to connect all other I/O signals via bond wires ( 67 ) to the package leads ( 53 ).
- the transmitting antenna ( 56 ) and receiving antenna ( 58 ) are disposed orthogonal to each other which minimizes mutual coupling.
- the apparatus ( 50 ) may comprise an impedance matching network for matching the impedances of the antennas and a device/circuit (e.g., power amplifier) on the IC chip ( 54 ).
- a device/circuit e.g., power amplifier
- an impedance matching network e.g., a transmission line
- FIGS. 6A–B as depicted in FIG.
- the solder balls ( 60 ) can be bonded to one end of an impedance matching network such as a balun connected to a coplanar transmission line formed on the IC chip ( 54 ), provide the inductive/capacitive impedance matching between the antenna and a device/component (e.g., power amplifier, LNA, etc.) connected to the other end of the impedance
- a device/component e.g., power amplifier, LNA, etc.
- any suitable high-frequency antenna e.g., about 20 GHz or greater
- the 60 GHz folded dipole antennas discussed above and depicted in FIGS. 3 A and 6 A–B are merely one exemplary embodiment of the invention for implementing an IC package device.
- IC packages according to other exemplary embodiments of the invention may be readily envisioned whereby one antenna is used for both transmitting and receiving for an integrated antenna and transceiver chip package design.
- the IC chip ( 54 ) depicted in FIGS. 6A–B may comprise an integrated transceiver chip, an integrated receiver chip, an integrated transmitter chip, etc., and/or other IC chips comprising necessary support circuitry for implementing a communications chip package.
- exemplary antenna designs which comprise printed antennas on substrates enable high-volume antenna manufacturing capability.
- integrated IC packages according to exemplary embodiments of the invention enable antennas to be integrally packaged with IC chips such as transceiver chips, which provide compact designs with very low loss between the transceiver and the antenna.
- IC chips such as transceiver chips
- the relatively small ground plane required for the exemplary antenna designs enable very compact packaging.
- such IC package designs eliminate the need to go off the transceiver chip with high frequency input and output signals, thereby providing low loss designs.
- antennas and integrated antenna packages according to the present invention enable a multitude of applications such as integrated phased array antenna systems, personal area networks, radar feeds, high reliability due to redundancy, point-to-point systems, etc.
- the use of integrated antenna/IC chip packages according to the present invention saves significant space, size, cost and weight, which is a premium for virtually any commercial or military application.
- antennas can be constructed having an array of two or more printed antenna formed on a substrate to provide an antenna with desired directivity for beamforming or beamsteering antenna applications.
- a directive antenna beam pattern can be obtained using a phased array antenna, wherein the input signal phase to each printed antenna is controlled to electronically scan or steer the directive antenna pattern to a desired direction. It could also be placed in the center of a focusing antenna for directional antenna applications such as point-to-point systems or radar systems.
- antenna designs according to exemplary embodiments of the invention can be implemented not only for MMW applications, but may also be used at lower frequencies.
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Abstract
Description
Claims (12)
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US10/881,104 US7119745B2 (en) | 2004-06-30 | 2004-06-30 | Apparatus and method for constructing and packaging printed antenna devices |
CNB2005100809394A CN100555747C (en) | 2004-06-30 | 2005-06-24 | The equipment and the method for structure and packaging printed antenna devices |
US11/524,599 US7545329B2 (en) | 2004-06-30 | 2006-09-21 | Apparatus and methods for constructing and packaging printed antenna devices |
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US10/881,104 US7119745B2 (en) | 2004-06-30 | 2004-06-30 | Apparatus and method for constructing and packaging printed antenna devices |
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US11/524,599 Expired - Fee Related US7545329B2 (en) | 2004-06-30 | 2006-09-21 | Apparatus and methods for constructing and packaging printed antenna devices |
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Also Published As
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US20070013599A1 (en) | 2007-01-18 |
US20060001572A1 (en) | 2006-01-05 |
US7545329B2 (en) | 2009-06-09 |
CN100555747C (en) | 2009-10-28 |
CN1716695A (en) | 2006-01-04 |
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